body{
  background-color: lightblue;
}
div {
  width:200px;
  height:200px;
  .box{
    background-color: #bfa;
    font-size: 35px;
  }
}
/*图片标签样式*/
#img1 {
  width: 200px;
  height: 200px;
  background-image: url("../assets/angular.jpg");
  background-size: 100% 100%;
}
#img2 {
  width: 200px;
  height: 200px;
  background-image: url("../assets/vue.jpg");
  background-size: 100% 100%;
}
#img3 {
  width: 200px;
  height: 200px;
  background-image: url("../assets/react.png");
  background-size: 100% 100%;
}